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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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R8C/2G 数据表(PDF) 104 Page - Renesas Technology Corp |
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R8C/2G 数据表(HTML) 104 Page - Renesas Technology Corp |
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104 / 344 page  R8C/2G Group 8. I/O Ports Rev.1.00 Apr 04, 2008 Page 84 of 318 REJ09B0387-0100 8.6 Notes on I/O Ports 8.6.1 Port P4_3, P4_4 Ports P4_3 and P4_4 are also used as the XCIN function and the XCOUT function, respectively. During a reset period and after a reset release, these ports are set to the XCIN and XCOUT functions. Pins P4_3 and P4_4 can be switched to the port functions by setting the CM04 bit in the CM0 register to 0 (ports P4_3 and P4_4) by a program. To use ports P4_3 and P4_4 as ports, note the following: • Port P4_3 After a reset until the CM04 bit is set to 0 (ports P4_3 and P4_4) by a program, a typical 10 M Ω impedance is connected between the P4_3 pin and the MCU power supply or GND. If the XCIN is set to intermediate-level input or left floating, a shoot-through current flows into the oscillation driver. • Port P4_4 Use port P4_4 as an output port by setting the PD4_4 bit in the PD4 register to 1 (output mode). After a reset until the CM04 bit is set to 0 (ports P4_3 and P4_4) by a program, the P4_4 pin may output an intermediate potential of about 2.0 V. |
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